添加设置页 (#362)

_data/navigation.yml

@@ -1,6 +1,8 @@
 main:
   - title: 常见问题
     url: /faq.html
+  - title: 设置
+    url: /settings.html
 
 docs:
   - title: 问题集合

_data/settings.yaml

@@ -0,0 +1,35 @@
+appearance_color:
+  type: radio
+  default: light
+  options:
+    - light
+    - dark
+    - auto
+appearance_skin_light:
+  type: radio
+  default: default
+  options:
+    - default
+    - air
+    - aqua
+    - contrast
+    - dark
+    - dirt
+    - neon
+    - mint
+    - plum
+    - sunrise
+appearance_skin_dark:
+  type: radio
+  default: dark
+  options:
+    - default
+    - air
+    - aqua
+    - contrast
+    - dark
+    - dirt
+    - neon
+    - mint
+    - plum
+    - sunrise